<?php
/** 
 * EGP Framework
 *
 * LICENSE
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * @author     Akon(番茄红了) <aultoale@gmail.com>
 * @copyright  Copyright (c) 2008 (http://www.tblog.com.cn)
 * @license    http://www.gnu.org/licenses/gpl.html     GPL 3
 */

!defined('EGP_LIB_DIR') && die('Access Deny!');

/**
 * 文件控制抽像类
 *
 * @package    classes
 * @author     Akon(番茄红了) <aultoale@gmail.com>
 * @copyright  Copyright (c) 2008 (http://www.tblog.com.cn)
 * @license    http://www.gnu.org/licenses/gpl.html     GPL 3
 */
abstract class EGP_File_Abstract
{

    /**
     * 图片文件扩展名类型
     *
     * @var array
     */
    protected $_imgExt = array('jpg', 'jpeg', 'gif', 'png', 'bmp', 'wbmp');

    /**
     * 是否图片文件
     *
     * @param  string  $filename
     * @return boolean
     */
    public function isImage($filename) {
        return in_array($this->getExtension(basename($filename)), $this->_imgExt);
    }

    /**
     * 获取文件扩展名
     *
     * @param  string  $filename
     * @return string
     */
    public function getExtension($filename) {
        return strtolower(substr(strrchr($filename, '.'), 1));
    }

}